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A motorcycle having a system for combustion knock control. The motorcycle includes a spark generating circuit having a spark plug. The spark generating circuit produces a spark across a spark gap of the spark plug in response to a sparking signal. The motorcycle further includes an ion signal circui

A motorcycle having a system for combustion knock control. The motorcycle includes a spark generating circuit having a spark plug. The spark generating circuit produces a spark across a spark gap of the spark plug in response to a sparking signal. The motorcycle further includes an ion signal circuit that provides an ion signal indicative of an ion current being generated across the spark gap, and an analysis module electrically connected to the ion signal circuit and the spark generating circuit. The analysis module generates the sparking signal in a timed sequence, receives the ion signal from the ion signal generating circuit, measures a knock intensity within the ion signal, and modifies the timing sequence when knock is present.

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A motorcycle having a system for combustion knock control. The motorcycle includes a spark generating circuit having a spark plug. The spark generating circuit produces a spark across a spark gap of the spark plug in response to a sparking signal. The motorcycle further includes an ion signal circui

A motorcycle having a system for combustion knock control. The motorcycle includes a spark generating circuit having a spark plug. The spark generating circuit produces a spark across a spark gap of the spark plug in response to a sparking signal. The motorcycle further includes an ion signal circuit that provides an ion signal indicative of an ion current being generated across the spark gap, and an analysis module electrically connected to the ion signal circuit and the spark generating circuit. The analysis module generates the sparking signal in a timed sequence, receives the ion signal from the ion signal generating circuit, measures a knock intensity within the ion signal, and modifies the timing sequence when knock is present. l is not being executed. 21. A control apparatus for an internal combustion engine, which controls an engine speed to a target engine speed during starting of the engine, by performing at least one control including intake air flow control under which an intake air flow rate is adjusted in accordance with the engine speed, and ignition timing control under which the ignition timing is adjusted in accordance with the engine speed, comprising: a switching unit that switches from the intake air flow control to the ignition timing control when it is determined that the engine is in a poor combustion state; a catalyst warm-up unit that delays the ignition timing by a catalyst warm-up delay amount during starting of the engine, so as to increase a temperature of an exhaust purifying catalyst disposed in an engine exhaust passage, said catalyst warm-up delay amount being measured from ignition timing after the temperature of the exhaust purifying catalyst is increased; and a detecting unit that detects a peak engine speed during starting of the engine after an engine starting operation is started; wherein said catalyst warm-up unit sets the catalyst warm-up delay amount to a smaller value during execution of the ignition timing control in accordance with a difference between a predetermined reference peak engine speed and the peak engine speed during starting of the engine,